Wanted to run something by all you wonderful gear experts. I play bass in a 4-piece cover band that is an on-again, off-again kind of deal. Drummer and keyboardist are modestly self-amped. Guitarist is also lead vocalist, and he tends to run his mic through this mic in on his looper pedal so that his vocals end up layered with his guitar, through his amp. Not a great solution because it has a pretty low threshold for feedback, but it gets him through practices, is portable enough, and avoids the (much discussed, thorny) issue of the band buying a PA together. I sing backup vocals. I'm about to nab a GK MB210 which, like many modern combos, has an AUX in - kind of a seldom used part on my last combo. My understanding is that on these types of amps, we're talking about a line level, unbalanced stereo input that is amped at a set level and combined with the instrument signal (post-EQ and post-levels) to share the speakers. My question is: if I got a mic, and found some way to convert from mic level to line level (e.g. through a mic preamp box?) and ran it into the AUX in of my bass amp, could I possibly use that to amplify my backup vocals while I'm playing bass in small venues (sans-PA)? Or is there something about this plan that dooms it to total failure?